下面的概念图显示了两个集合中的完整项目，以及这两个集合彼此进行内部联结或左外部联结之后剩下的项目。
The following illustration shows a conceptual view of two sets and the elements within those sets that are included in either an inner join or a left outer join.
下面的概念图显示了两个集合中的完整项目，以及这两个集合彼此进行内部联结或左外部联结之后剩下的项目。
The following illustration shows a conceptual view of two sets and the elements within those sets that are included in either an inner join or a left outer join.
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